Section 3
Calibration Procedure
For best results, the gas concentration should be as close to the expected levels of emissions as possible.
Because each sensor is linear through a nominal range, one calibration gas concentration can be used for a
reasonably wide range of emission levels. For applications with extremely low or extremely high levels of
emissions, with respect to the sensors operation range, the sensors should be calibrated as close as
possible to desired levels to be measured. It is also recommended that, in gas mixtures that will support an
oxygen content, that a small percentage of oxygen (i.e. 2% - 5%) be in the calibration gas to aid in the
system leak check.
1. Ensure battery is fully charged. Put unit on charge the night before you plan to use analyzer to ensure
full charge of battery. Attach sample line, T-air probe, T-gas probe / sample line and power cord. Switch
on analyzer and remote display. Leave remote display in instrument cradle for calibration procedure.
2. Accept Fuel Selection with “OK” key, and select NO (F4) for Data Processing option.
3. Allow instrument to complete the 3 minute initialization and auto-zero procedure.
4. Select Gas Measurement option to perform the Air Leak test.
Air Leak Test:
1. Apply nitrogen balanced gas to analyzer through probe/sample line (you can use NO calibration gas that
is balanced in nitrogen).
2. Allow gas to flow for 3 minutes. Check that O2 reading is 0.0% (spec is +/- 0.2%). If reading other than
0.0 % , troubleshoot to source of leak and correct.
3. Do not proceed to calibrate analyzer until air leak is corrected.
To place analyzer in calibration mode perform the following steps:
1. Select “CONTROL” on main menu. Once the control screen appears, locate the battery reading (should
have at lest 6.0 volts). If battery reads anything less that 6.0 VDC consider replacing battery in near
future. Analyzer shuts off when battery reaches 5.5 VDC.
2. Swipe calibration magnet over the area near the ON/OFF switch on the remote display, located on
bottom left corner of the keypad. The calibration screen should appear on display.
3. Using the “up or down arrows” on keypad scroll cursor to the sensor that you wish to calibrate first. The
order of calibration does not matter.
Calibration of gas sensors:
With the exception of the O2 sensor, all sensors are calibrated using the same steps:
1. Connect calibration gas to analyzer using one of the following 3 set-ups:
a. (1
st
option) Vented flow meter configuration. Ensure sensors are not over or under pressurized by
allowing small amount of gas to out of flow meter. This prevents air from entering the system and
allows pump to control the analyzers internal pressure
b. (2
nd
option) Vented flow meter configuration. Ensure sensors are not over or under pressurized
by allowing small amount of gas to out of flow meter. This prevents air from entering the system
and allows pump to control the analyzers internal pressure
c. (3
rd
option) Use of a 15-liter gas bag or higher to ensure enough gas is present for analyzer to
stabilize. A gas bag allows analyzer to draw gas at the correct flow rate.
2. Flow calibration gas 5 minutes to sensor under test.
3. After reading has stabilized for sensor under test, press “OK” to display the input mode. Correct
calibration by inputting the value of the calibration gas being applied via the numbers on the keypad.
Confirm by pressing “OK”.
4. Remove and store calibration gas.
5. Repeat steps above for next sensor.
6. After calibration of all sensors allow the analyzer to flush with fresh air 5 minutes or until readings are
below 10 ppm for all sensors.
7. Press “menu” to back out to main menu & to select “Gas measurement” screen.
8. Press power switch to turn off analyzer.
